Here is the manual:
http://www.horizonhobby.com/ProdInfo...600_manual.pdf
You have to remove the PC board from the case and move a jumper. Not real convenient but real bad either. I would have to examine the connector in question to determine how well it retains the jumper before I decide how well I like it. Would hate to have it fall out. [:@] But I'm sure JR thought of that too.